Masses of atoms & metals-->
- Relative atomic mass (Ar) is the mass of an atom compared to 1 atom of carbon12.
It's the bigger number on the periodic table
- Relative formula mass (Mr) is the sum of all Ars in a formula (compoud) Eg- Mr for CO = 12+16 = 28.
- The Mr/Ar of a substance in grams is called one mole of that substance…